Expose '--i18n-duplicate-translation`option for build target

[minijus]

Which @angular/* package(s) are relevant/releated to the feature request?

compiler-cli, compiler, localize

Description

For applications that use duplicate translations build output become verbose with warnings.
It would be great to expose new --i18n-duplicate-translationoption on ng build in a similar manner that it is already done with --i18n-missing-translation.

translatealready supports this with duplicateTranslation option, but this option is not exposed up to ng build.

Proposed solution

Expose new --i18n-duplicate-translationoption on ng build.

Alternatives considered

None. Exposing what is already supported seem like a proper way.

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